package cn.tedu.mintmall.filter;


import cn.tedu.mintmall.vo.AdminDetailsVO;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(filterName = "MyFilter",urlPatterns = {"/insertProduct.html","/admin.html"})
public class MyFilter implements Filter {
    //当过滤器初始化时执行的方法
    public void init(FilterConfig config) throws ServletException {
    }

    //当过滤器销毁时执行的方法
    public void destroy() {
    }

    //当接收到请求时会执行此方法,需要在此方法中进行判断 是否允许访问Controller 或静态资源文件
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest st = (HttpServletRequest) request;
        HttpServletResponse se = (HttpServletResponse) response;
        //的到会话对象
        HttpSession session = st.getSession();
       AdminDetailsVO admin = (AdminDetailsVO) session.getAttribute("admin");
        if (admin!=null){
            chain.doFilter(request,response);//放行
        }else{
            //代表未登录
            se.sendRedirect("/login.html");//重定向 让客户端重新向指定的地址发出请求
        }
        System.out.println("过滤器执行了");
        chain.doFilter(request, response);//放行 允许访问资源
    }
}
